Cessna O-2 Skymaster

The Cessna O-2 Skymaster (nicknamed "Oscar Deuce") is a military version of the Cessna 337 Super Skymaster, used for forward air control (FAC) and psychological operations (PSYOPS) by the US military between 1967 and 2010.

O-2 Skymaster
O-2A Skymaster
Role Observation aircraft
National origin United States
Manufacturer Cessna
First flight January 1967
Introduction March 1967
Retired 2010 (United States)
Status Limited service
Primary users United States Air Force (historical)
Botswana Air Force
Salvadoran Air Force
Produced 1967–1975
Number built 513
Developed from Cessna Skymaster

Design and development
The O-2 lacks the 337 propeller spinner

In 1966 the United States Air Force (USAF) commissioned Cessna to build a military variant of the Skymaster to replace the O-1 Bird Dog.

As with the civilian version, the Skymaster was a low-cost twin-engine piston-powered aircraft, with one engine in the nose of the aircraft and a second engine in the rear of the fuselage. The push-pull configuration meant a simpler single-engine operating procedure due to centerline thrust compared to the common low-wing mounting of most twin engine light planes, and also allowed for a high wing, providing clear observation below and behind the aircraft.

Modifications made for the military configuration included installation of single seating fore and aft (i.e. two tandem seats available for pilot and observer, vs. 6 seats available in the civilian version); installation of view panels in the doors (for improved ground observation); installation of flame-retardant foam in the wing-mounted fuel tanks (slight increase in empty vehicle weight; 3% reduction in available fuel capacity); installation of military communication and navigation equipment in lieu of available civilian equipment and antennas; deletion of propeller spinners; increased gross weight (5,400 lb vs. 4,400 lb in civilian version), with component strengthening as required to support the increase; and deletion of interior upholstery.

The first O-2 flew in January 1967 and the plane went into production shortly thereafter. Performance (especially at cruising altitudes) was degraded due to the added antennas and significant weight increase, but was considered sufficient for the anticipated low-level operation.

Operational history

U.S. Air Force
O-2B Skymaster dropping leaflets over Vietnam

The USAF took delivery of the O-2 Skymaster in March 1967 and the O-2A also entered the U.S. Army's inventory during 1967, from USAF stock. By 1970, a total of 532 O-2s had been built, in two variants, for the USAF.

During the Vietnam War, the O-2A was introduced as a replacement for the O-1 Bird Dog, in the forward air control (FAC) aircraft and served in that role with the 20th Tactical Air Support Squadron. The O-2B was equipped with loudspeakers and a leaflet dispenser for use in the psychological operations (PSYOPS) role.

While it was intended that the Skymaster be replaced in the FAC mission by the OV-10 Bronco, the O-2A continued to be used for night missions after the OV-10's introduction, due to the OV-10's high level of cockpit illumination, rendering night reconnaissance impractical.[1] The O-2 was phased out completely after additional night upgrades to the OV-10.[2][3]

A total of 178 USAF O-2 Skymasters were lost in the Vietnam War, to all causes.[4]

Following the Vietnam War, the O-2 continued to operate with both U.S. Air Force and Air National Guard units into the late 1980s.

U.S. Navy

Six former USAF O-2A airframes were transferred to the U.S. Navy in 1983 for use as range controllers with Attack Squadron 122 (VA-122), the Pacific Fleet Replacement Squadron for the A-7 Corsair II at Naval Air Station Lemoore, California. These aircraft were later transferred to Strike Fighter Squadron 125 (VFA-125), the F/A-18 Hornet FRS at NAS Lemoore, in 1986 for use in the same range control role.[5] These O-2A aircraft were eventually replaced by T-34C Turbomentor aircraft transferred from the Naval Air Training Command.

U.S. Army

Of the six USN aircraft mentioned above, two were transferred to the U.S. Army in late 1990.[5] USAF O-2As were augmented by the 1990 aircraft transfer from the Navy. Several disassembled USAF O-2s remain in storage at Davis-Monthan AFB, Arizona.[5] Two O-2As were used at Laguna Army Airfield, Arizona as part of testing programs carried out by the Yuma Proving Ground. These were retired in October 2010 and sent to a museum.[6]

South Vietnam

35 USAF O-2 aircraft were later transferred to and operated by the former Republic of Vietnam Air Force.[3]

El Salvador

During the Salvadoran Civil War, the Salvadoran Air Force received a total of 23 O-2As and 2 O-2Bs from the United States, the first arriving in 1981. They were employed to observe the movements of FMLN formations and direct air strikes against them, playing a major role in forcing the rebel movement to abandon large-scale operations.

Near the end of the war in 1990, the rebels' acquisition of SA-7 missiles resulted in the loss of two O-2As, while another was destroyed by mortar fire, and two more were lost in crashes.[7]

CAL FIRE

In the mid 1970s, the California Department of Forestry and Fire Protection, or CAL FIRE, found that the contractor-owned air attack aircraft, mostly single-engine Cessna 182s and Cessna 210s, did not provide the airspeed and safety needed for the department's new air tanker program. In 1974, Senior Air Operations Officer Cotton Mason inspected 40 USAF O-2s at Davis-Monthan Air Force Base. The best 20 were selected and shipped to Fresno, California. These aircraft had been FAC aircraft in Vietnam and were shipped back to the United States in containers, and were disassembled and on pallets when they arrived at Fresno. A crew of California Conservation Corps (CCC) members under the supervision of a CDF Battalion Chief, who was an FAA Certificated Mechanic with Inspection Authorization (IA), reassembled the aircraft.

They were placed in service in 1976, and served CAL FIRE for more than 20 years, until replaced by a fleet of OV-10 Broncos.[8]

Variants
Planform view showing attachment points
O-2A
Version designed for use in forward air control missions, features underwing ordnance hard points to hold rockets, gun pods or flares. 513 delivered.[3]
O-2B
Version designed for psychological warfare, equipped with loudspeakers and a leaflet dispenser, but otherwise carried no weapons. Thirty-one former civil 337s were converted to O-2Bs.[9]

Operators
 Botswana
 Costa Rica
 Dominican Republic
 Ivory Coast
 Haiti
  • Haitian Air Force – Eight (in service 1975–98)[11] Reportedly six of these are Model 337s, and only two O-2As.[10]
An O-2A of the Imperial Iranian Air Force
Iran
  • Imperial Iranian Air Force – twelve O-2A delivered 1972.[12]
 Namibia
  • Namibian Air Force – Six O-2A,[10] five of which were delivered on June 26, 1994, for use in the anti-poaching and anti-smuggling rôle.[13]
 El Salvador
 Solomon Islands
  • Solomon Islands Government – Two O-2A.[10]
 South Korea
 South Vietnam
 Thailand
 United States
 Uruguay
 Zimbabwe
  • Zimbabwe Air Force – Two O-2A delivered 1994–1995.[10]

Aircraft on display
Displayed at the Museum of Aviation (Warner Robins)

Specifications (O-2)
O-2 Line drawing

Data from [40]

General characteristics

  • Crew: 2[41]
  • Length: 29 ft 9 in (9.07 m)
  • Wingspan: 38 ft 0 in (11.58 m)
  • Height: 9 ft 4 in (2.84 m)
  • Wing area: 202.5 sq ft (18.81 m2)
  • Aspect ratio: 7.13:1
  • Empty weight: 2,848 lb (1,292 kg)
  • Max takeoff weight: 5,400 lb (2,449 kg)
  • Powerplant: 2 × Continental IO-360C/D air-cooled flat-six engines, 210 hp (160 kW) each

Performance

  • Maximum speed: 199 mph (320 km/h, 173 kn) at sea level
  • Cruise speed: 144 mph (232 km/h, 125 kn) at 10,000 ft (3,000 m)
  • Range: 1,060 mi (1,710 km, 920 nmi)
  • Service ceiling: 19,800 ft (6,000 m)
  • Rate of climb: 1,180 ft/min (6.0 m/s)

Armament

See also

Related development

Aircraft of comparable role, configuration, and era

References
  1. The OV-10 Bronco Association (March 2002). "What is the Pave Nail system?". Retrieved 3 May 2010.
  2. Skutack, Daniel (February 2003). "COVEYs in Southeast Asia" (PDF). Archived from the original (PDF) on 8 July 2011. Retrieved 3 May 2010.
  3. "Fact Sheets: Cessna O-2A Skymaster, Cessna O-2A Skymaster". Archived from the original on August 1, 2008.
  4. Hobson, Chris. Vietnam Air Losses, USAF/USN/USMC/ Fixed-Wing Southeast Asia 1961–1973. 2001. ISBN 1-85780-115-6
  5. United States Military Aviation Directory, AIRTime Publishing, Norwalk CT, c2000, p. 231, ISBN 1-880588-29-3
  6. James Gilbert (October 2010). "Retired aircraft soars in Yuma one last time". Army Times Publishing Company. Retrieved 14 November 2010.
  7. Cooper, Tom. "El Salvador, 1980–1992". ACIG.org. Retrieved 30 January 2013.
  8. "Public domain material from "CDF Aviation Management History", CDF official website, retrieved 23 August 2007".
  9. Andrade 1979, p. 140
  10. "Cessna Skymasters used by non-US Air-Forces" Archived March 12, 2010, at the Wayback Machine, Skymaster.org.uk. Accessed 10 May 2010.
  11. "Haiti Air Force". www.aeroflight.co.uk.
  12. "21st. Counter Insurgence Squadron O-2A". Archived from the original on July 27, 2012.
  13. AIR International, December 1994, p. 323.
  14. World Air Forces – Historical Listings Thailand (THL), archived from the original on 25 January 2012, retrieved 30 August 2012
  15. "Aviation Photo #1611364: Cessna O-2A Pelican - USA - Navy". Airliners.net.
  16. Porfilio, Gabriel (19 June 2017). "Uruguayan Navy accepts three Cessna O-2As from Chile". IHS Jane's 360. Orlando. Archived from the original on 20 June 2017. Retrieved 20 June 2017.
  17. United States Air Force Museum Archived 2010-07-26 at the Wayback Machine
  18. "Cessna O-2A Skymaster". National Museum of the United States Air Force™.
  19. "Hulburt Field - O-2A Skymaster". Archived from the original on June 23, 2010.
  20. "vmap - O-2A Skymaster (Gray)". Vmap.wikispaces.com. 20 November 1967. Archived from the original on 24 March 2016. Retrieved 20 February 2014.
  21. Shaw AFB Archived 2010-10-05 at the Wayback Machine
  22. USAF Armament Museum Archived 2010-09-07 at the Wayback Machine
  23. New York ANG - 105th AG, Newburgh Archived 2010-07-03 at the Wayback Machine
  24. USAF History and Traditions Museum Archived 1999-08-31 at the Wayback Machine
  25. Kelly Field Heritage Museum Archived 2010-07-26 at the Wayback Machine
  26. Dyess Linear Air Park Archived 1999-08-31 at the Wayback Machine
  27. Air Mobility Command Museum Archived 2010-12-04 at the Wayback Machine
  28. Travis Air Force Museum Archived 2010-07-29 at the Wayback Machine
  29. "Hill Air Force Base - Fact Sheet: SUPER SKYMASTER". Hill.af.mil. Archived from the original on 21 September 2012. Retrieved 16 September 2012.
  30. "Museum of Aviation - Cessna O-2A Skymaster". Archived from the original on September 23, 2010.
  31. "Grissom Air Museum - Cessna O-2A Skymaster". Archived from the original on December 1, 2010.
  32. Illinois ANG - 182nd AG, Peoria Archived 2010-06-23 at the Wayback Machine
  33. Pima Air & Space Museum Archived 2010-07-26 at the Wayback Machine
  34. Castle Air Museum Archived 2006-02-06 at the Wayback Machine
  35. "USAF Serial Number Search (67-21411)". Retrieved 2018-02-14.
  36. Valiant Air Command Museum Archived 2010-12-04 at the Wayback Machine
  37. https://www.evergreenmuseum.org/cessna-o-2-skymaster, Retrieved April 29, 2020
  38. March Field Air Museum Archived 2010-08-13 at the Wayback Machine
  39. "American Wings Air Museum". aviationmuseum.eu. 16 October 2013. Retrieved 17 May 2016.
  40. Donald & Lake 1996, p. 115
  41. Dorr & Bishop 1996, p. 237
  42. "T". Chancefac.net. Retrieved 20 February 2014.

Bibliography
  • Andrade, John (1979). U.S. Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0-904597-22-9.
  • Donald, David; Lake, Jon, eds. (1996). Encyclopedia of World Military Aircraft (Single volume ed.). London: Aerospace Publishing. ISBN 1-874023-95-6.
  • Dorr, Robert F.; Bishop, Chris (1996). Vietnam Air War Debrief. London: Aerospace Publishing. ISBN 1-874023-78-6.

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